%%%-------------------------------------------------------------------
%% @doc kvcache top level supervisor.
%% @end
%%%-------------------------------------------------------------------

-module(kvcache_sup).

-behaviour(supervisor).

-export([start_link/0]).

-export([init/1]).

-define(SERVER, ?MODULE).

start_link() ->
    supervisor:start_link({local, ?SERVER}, ?MODULE, []).

%% sup_flags() = #{strategy => strategy(),         % optional
%%                 intensity => non_neg_integer(), % optional
%%                 period => pos_integer()}        % optional
%% child_spec() = #{id => child_id(),       % mandatory
%%                  start => mfargs(),      % mandatory
%%                  restart => restart(),   % optional
%%                  shutdown => shutdown(), % optional
%%                  type => worker(),       % optional
%%                  modules => modules()}   % optional
init([]) ->
    Config   = application:get_all_env(kvcache),
    Timeout  = proplists:get_value(cache_timeout, Config, 4), % 默认 4 小时

    SupFlags = #{ strategy => one_for_all
                , intensity=> 0
                , period   => 1
                },

    KVWorker = #{ id       => kvcache_worker
                , start    => {kvcache_worker, start_link, [Timeout]}
                , restart  => permanent
                , shutdown => 5000
                , type     => worker
                , modules  => [kvcache_worker]
                },

    ChildSpecs = [KVWorker],
    {ok, {SupFlags, ChildSpecs}}.

%% internal functions
